Compare two generic Lists

Hi ,how I can compare two 开发者_高级运维Lists, the first type ICollections <T> the other List<T> see if they contain the same records using Linq

Assuming ICollection<T> x and List<T> y...

If order of the records matters:

return x.SequenceEqual(y);

If order doesn't matter, I think your best option is to skip LINQ and use a HashSet<T>:

return new HashSet<T>(x).SetEquals(y);

Here is a sample code depending on whether sequence is important or not :

        ICollection<int> collection1 = new List<int> { 5, 1, 6, 7, 3 };
        List<int> collection2 = new List<int> { 1, 5, 6, 7, 3 };

        bool considerSequence = true; // sequence is important
        bool areEquael;

        if (considerSequence)
        {
            areEquael = collection1.SequenceEqual(collection2);
        }
        else
        {
            areEquael = collection1.OrderBy(val => val).SequenceEqual(
                collection2.OrderBy(val => val));
        }

As suggested by other colleagues also consider using HashSet<T>. Just take into account that HashSet is available only starting from .NET Framework 3.5.

    List<Guid> lst = new List<Guid>();
    List<Guid> lst1 = new List<Guid>();
    bool result = false;

    if (lst.Count == lst1.Count)
    {
        for (int i = 0; i < lst.Count; i++)
        {
            if (!lst[i].Equals(lst1[i]))
            {
                result = false;
                break;
            }
        }
    }
    else
    {
        result = false;
    }

    if (result)
    {
        Response.Write("List are same");
    }
    else
    {
        Response.Write("List are not same");
    }

use this type of concept....

OR

    List<int> lst = new List<int>();
    lst.Add(1);
    lst.Add(51);
    lst.Add(65);
    lst.Add(786);
    lst.Add(456);
    List<int> lst1 = new List<int>();
    lst1.Add(786);
    lst1.Add(1);
    lst1.Add(456);
    lst1.Add(65);
    lst1.Add(51);
    bool result = false;

    if (lst.Count == lst1.Count)
    {
        result = lst.Union(lst1).Count() == lst.Count;
    }

    if (result)
    {
        Response.Write("list are same");
    }
    else
    {
        Response.Write("list are not same");
    }

try this one also.....

ICollection<int> list1 = new List<int>() { 1, 2, 3, 4, 5, 6 };
List<int> list2 = new List<int>() { 6, 7, 8, 9 };

bool contains = list1.Any(e => list2.Any(d => d.Equals(e)));